I was trying to select min sdk version to 11. After I finish creating the project, the main activity still shows I am importing v7 ActionBarActivity:
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
...
Did I configure something wrong?
Thanks
Open your build.gradle file and make sure that minSdkVersion is set to 11.
Click the Sync Gradle Files button on the toolbar to the left of the SDK manager
the Gradle files will now be automatically re-imported
Clean and Rebuild your project
For those using Android Studio 0.8.6 and having the same issue while following Google's tutorials, what worked for me was to add this line under "dependecies" in your module build.gradle file:
dependencies {
compile 'com.android.support:appcompat-v7:20.0.0'
}
it worked for me!
:)
No, android studio import it automatically because there are some features that worked since version 14.
For example: when you set the actionbar in your XML document and you want to hide / show some item you use "android:showAsAction" attribute, but the compiler generates an error, because that works only on version 14 and later.
So, the compiler tells you that you have to change it in "yourapp:showAsAction" (because you declared to support version 11) where "yourapp" is a namespace that you've imported in your xml file:
xmlns:yourapp="http://schemas.android.com/apk/res-auto
Remember that "yourapp" can be every name you want! Well, now if you test your app you find out that show / hide functionality doesn't work properly, and this is because your activity doesn't extends ActionBarActivity. This is why androidStudio automatically extends ActionBarActivity when you declare a minSdk of 11.
Hope this post was useful, bye!
Related
Im following headfirst methodology to learn to code in androidstudio.
they provide some code for building a simple navigation drawer app.
in order to be compatible with previous android version, they advise to import :
import android.content.Intent;
import android.support.design.widget.NavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
but in my last version of android studio this doesnt work : some of them are greyed and alt+enter does not import the correct library when i put the java code provided by my methodology.
so i replaced a few imports with the newer versions. for example :
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.app.ActionBarDrawerToggle ;
import android.widget.Toolbar;
however, i did not find anything for to import "NavigationView" and com.google.android.material.navigation.NavigationV iew is grayed when i try to import it.
So my question is basic: how do i know which lib to import when android studio does not suggest anything with alt+enter and when the libraries have evolved? the question could be asked for many programs i guess ..is there a standard methodology to upgrade the code?
You first need to include your dependencies in your build.gradle (app) file.
For example, your NavigationView is a part of Google's Material library. This library does not come included in Android SDK when you create the project and therefore you need to add the library under 'dependencies' in your build.gradle (app) file in order to use it:
dependencies {
implementation 'com.google.android.material:material:1.3.0-alpha01'
}
This way, upon the build of the project, Gradle will download the library and include it in your project so you can use the Material components. You can usually find the gradle dependency you need to include with a quick Google search.
Another thing to note is that the legacy support libraries have been replaced with AndroidX as you can read here:
https://developer.android.com/topic/libraries/support-library
https://developer.android.com/jetpack/androidx
And you can find the full list of AndroidX support libraries in here:
https://developer.android.com/jetpack/androidx/explorer
I'm using Android Studio and build as "Generate Signed APK...". And I faced the error, "Unused import statement" like following.
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.FragmentActivity; // <- specified as unused ERROR
import android.support.v4.app.FragmentManager; // <- specified as unused ERROR
import android.support.v4.view.ViewPager; // <- specified as unused ERROR
import android.util.Log;
public class Main extends FragmentActivity {
...
}
But I can easily see FragmentActivity is used in code. How can I fix it? This error happens all over my codes...
This is because you have "Optimize imports on the fly" enabled, which automatically removes unused imports. You likely also have "Add unambiguous imports on the fly" selected, which automatically adds imports you need. The solution is to write the code first, and watch your imports be added automatically, and manually add any ambiguous ones, as they become needed.
https://www.jetbrains.com/idea/help/creating-and-optimizing-imports.html?search=optim
In the event this does not work for you, or if you simply prefer to enter your own import statements, then simply disable the features in settings > Editor > Auto Import.
When I updated the android studio to 3.3.1 I go this error.
Solved it by updating the libraries and compileSdkVersion to the latest version that is 27. Hope it will help someone else.
I meet the problem in the Android studio 3.2.1. Invalidate and delete ./idea does not work. It disappear when I upgrade 3.4.1.
I have tried invalidating the caches and restarting but it still shows up and will not compile and run as it used to before. I tried renaming the class file if i remember correctly and must have changed the name on something that made this how up. It also gives me the same error where findViewById, .oncreate, and setContentView. I migh have also renamed or tried to rename one of the packages because it was examplecom and it wouldnt allow me to upload it.
package com.threedeestone.mike.threedeestone;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.widget.EditText;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.text.DecimalFormat;
public class MainActivity extends ActionBarActivity {
To use the ActionBarActivity or the AppCompatActivity you have to add the appcompat library to your dependencies.
Add in your build.gradle file the last version:
dependencies {
...
compile "com.android.support:appcompat-v7:23.0.0"
}
The version 23.0.0 requires to compile the project with API 23.
Otherwise you can use the 22.2.1.
Also pay attention.
The ActionBarActivity is deprecated. Check the official javadoc.
You should use the AppCompatActivity.
Check this blog where explains the changes on the Library.
ActionBarActivity is deprecated, you should use AppCompatActivity instead and make a clear project and try it out.
public class MainActivity extends AppCompatActivity {
If the issue still it could be that in your gradle.app you don't have added this line of code
compile 'com.android.support:appcompat-v7:22.1.1'
Even after clicking on Add Support Library and choosing version 19, eclipse still can't find android.support.v4.widget.SwipeRefreshLayout. Does anyone know how to get this to work? I am using
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="19" />
I am working on a mac mavericks computer with Juno.
update: import section
import java.util.Observer;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.support.v4.widget.SwipeRefreshLayout;//red underline
Update
By the way, I don't know if this matters: this is an Appengine Connected Android Project, which I build using Google-Eclipse-Plugin
Update 3:
It's looking like the Android Support Library 19.1.0 is not available through the SDK Manager. How else might I obtain it?
It was difficult to update the support library to version 19.1 so i downloaded it manually from https://dl-ssl.google.com/android/repository/support_r19.1.zip and added the jar to my build path manually. works for me. I dont know why the 19 update shows instead of 19.1.0
So it turns out the library is in the following location
/android-sdk-macosx/extras/android/m2repository/com/android/support/support-v4/19.1.0
As opposed to the usual
/android-sdk-macosx/extras/android/support
Also I had to restart eclipse and go to Android SDK Manager over and over and over, until the 19.1.0 version shows up.
I hope this saves someone else some trouble.
The SDK Manager update Android Support Library to 19.1.0.
But when you use Android Tools > Add Support Library, eclipse update Android Support Library to 19.0. I think this is a bug. Copy Android Support Library 19.1.0 to libs folder manually.
It looks as if you don't have the android-support-v4.jar in Java Build Path. Add it from the android-support-v7-appcompat.
For some reason, even though you may include v4 support library or you may have v7-appcompat included in your project, you may not be able to import SwipeRefreshLayout.
You need to make sure that
you change the target=android-19 to target=android-22(It should be anything greater that 19) and
manually import : import android.support.v4.widget.SwipeRefreshLayout; in your activity which will resolve the import related issue.
I had the same problem with old project. But when I create new project, Eclipse can find this import.
It's a problem with updating support library from eclipse: https://code.google.com/p/android/issues/detail?id=67991
Just update it by starting Android SDK manager manually and add new v4 lib to your project.
Thanks for tehnolog's tips.
Update to 19.1 by follow above link -> create new project and import android.support.v4 library -> simply copy android.support.v4.jar to old project's libs folder, Add To BuildPath. SwipeRefreshLayout will appear :D
In androidx, add
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
inorder to use SwipeRefreshLayout
Ok i'm just starting to get into Android programming now, and I'm following the android "TabActivity" tutorial: http://developer.android.com/reference/android/app/TabActivity.html.
Everythings working but it can't seem to find some of the support classes, see the code below that is generating the errors.
mTabManager.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"),
FragmentStackSupport.CountingFragment.class, null);
mTabManager.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"),
LoaderCursorSupport.CursorLoaderListFragment.class, null);
mTabManager.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"),
LoaderCustomSupport.AppListFragment.class, null);
mTabManager.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"),
LoaderThrottleSupport.ThrottledLoaderListFragment.class,null);
For FragmentStackSupport/LoaderCursorSupport/LoaderCustomSupport/LoaderThrottleSupport, it says for all of them cannot be resolved to a type. I've added the latest support library to a folder in the root directory named "libs" and also coppied it into "C:/Eclipse/v4/" directory. My import files are:
import java.util.HashMap;
import android.R;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.FragmentPagerAdapter;
import android.view.View;
import android.widget.TabHost;
import cowdawg.hello_tab.namespace.R.layout;
import cowdawg.hello_tab.namespace.R.id;
Could someone please offer me some advice on how to solve this, thanks :).
It's probably because the following classes are not part of the standard Android API (or the support library), but only exist in the support demos sample code for demonstration purposes:
FragmentStackSupport.CountingFragment
LoaderCursorSupport.CursorLoaderListFragment
LoaderCustomSupport.AppListFragment
LoaderThrottleSupport.ThrottledLoaderListFragment
You will need to add these classes to your own project in order to be able to use them. Here you can find the source files under the subsection 'Files'.
FragmentStackSupport
LoaderCursorSupport
LoaderCustomSupport
LoaderThrottleSupport
On Eclipse IDE: Select your project and then right click on the project -> Android Tools -> Add Support Library.
Required support library will be added on your project build path. You will found this library jar under Java Build Path -> Libraries tab -> Android Dependencies.
Enjoy exploring!
Have you added the library to your build path? Right click on the jar in eclipse -> Build Path -> Add to Build Path.
Try adding by right clicking on the project and opening properties window
Instead of these missing classes you can create your own by subclassing Fragment class (or its subclasses like DialogFragment, ListFragment etc). More info is provided by Android here.